Pete Lovely, F1 Lotus-BRM Riverside Oct 67?

I've just come across a brief mention of a Formula race supporting the Riverside Can-Am on October 29th 1967, in which it states that Pete Lovely drove a 'Formula 1 Lotus-BRM' to victory, which had reportedly been loaned to him as a result of him doing the works team a favour at the previous week's Mexican Grand Prix.

I cannot imagine it would have been a Type 43, so presumably this was the Mike Fisher 33 R11 which raced in Canada and was entered but a DNS in Mexico? Does anybody have any photos of this appearance by any chance to confirm this?